The easiest way for you to answer your question is to look at the BA programmes of a number of universities, including the ones you may like to apply to in a couple of years.
On the whole, if you want to study History at Russell Group unis, you will need History A-level. There are some exceptions, but in order to have the broadest choice History A-level is the wisest course of action.
Beyond the Russell Group, however, you will find that unis will be less insistent on History A-level, as long as you can motivate your application in some other way, e.g. English Literature, Welsh First Language, Religious Studies, Philosophy or Law (or another "essay" subject).
Ask yourself, though, if History is your eventual goal, why not take it now for A-level?